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Are PVC windows in old houses without a modern ventilation system dangerous?

If the house does not have a mechanical ventilation system, too much air tightness can be dangerous for your health. Above all, it can lead to significant condensation phenomena that can lead to the formation of mold on certain walls. It is therefore particularly important to ensure that the existing vents are not plugged or installed. A good VMC, normally, also ensures satisfactory air renewal.

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